Atrophy is a basic program that uses MDK3 to attempt to reboot routers (helpful when trying to unlock WPS.) The program uses Authentication flood, Michael Integrity Check failure, beacon flood, and deauthentication (a few others too depending on your configuration.)
ReVdk3 is a similar program to Atrophy, but it uses a different approach to attack an access point. It uses EAPOL start and stop attacks to attempt to reboot the router.
Frankenscript 2 is a full blown program that offers a wide range of tools to attack access points. You can find more info here.